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MM74HCT193 Datasheet

  • MM74HCT193

  • Synchronous Binary Up/Down Counters

  • 9頁

  • NSC

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MM54HCT193 MM74HCT193 Synchronous Binary Up Down Counters
January 1988
MM54HCT193 MM74HCT193
Synchronous Binary Up Down Counters
General Description
These high speed synchronous counters utilize advanced
silicon-gate CMOS technology to achieve the high noise im-
munity and low power consumption of CMOS technology
along with the speeds of low power Schottky TTL The
MM54HCT193 MM74HCT193 is a binary counter having
two separate clock inputs an UP COUNT input and a
DOWN COUNT input All outputs of the flip-flops are simul-
taneously triggered on the low-to-high transition of either
clock while the other input is held high The direction of
counting is determined by which input is clocked
This device has TTL compatible inputs It can drive 15 LS-
TTL loads
This counter may be preset by entering the desired data on
the DATA A DATA B DATA C and DATA D inputs When
the LOAD input is taken low the data is loaded indepen-
dently of either clock input This feature allows the counter
to be used as a divide-by-n counter by modifying the count
length with the preset inputs
In addition the HCT193 can also be cleared This is accom-
plished by inputting a high on the CLEAR input All 4 internal
stages are set to a low level independently of either COUNT
input
Both a BORROW and CARRY output are provided to en-
able cascading of both up and down counting functions The
BORROW output produces a negative-going pulse when
the counter underflows and the CARRY outputs a pulse
when the counter overflows The counter can be cascaded
by connecting the CARRY and BORROW outputs of one
device to the COUNT UP and COUNT DOWN inputs re-
spectively of the next device
All inputs are protected from damage due to static dis-
charge by diodes to V
CC
and ground
Features
Y
Y
Y
Low quiescent supply current 80
mA
maximum (74HCT
Series)
Low input current 1
mA
maximum
TTL compatible inputs
Connection Diagram
Dual-In-Line Package
Truth Table
Count
Clear
Up
Down
H
Load
H
H
X
L
Function
Count Up
Count Down
Clear
Load
u
H
X
X
H
e
high level
L
e
low level
u
X
X
L
L
H
L
u
e
transition from low-to-high
X
e
don鈥檛 care
TL F 5742 鈥?1
Order Number MM54HCT193 or MM74HCT193
C
1995 National Semiconductor Corporation
TL F 5742
RRD-B30M105 Printed in U S A

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